Typographical casting machine



D.S.KENNEDY. TYPOGRAPHICAL CASTING MACHINE.

APPLICATION FILED AUG.25| I92I`.

Patented M ay 9, 1922.

:N VENTOR A T10/e NE YL UNITED STATES PATENr oFFlcr..

DAVID S. KENNEDY, OF BROOKLYN, NEW YORK, ASSIGNOR TO MERGENTHALER LINO-5 TYPE COMPANY, A CORPORATION 0F NEW YORK. i

TYPOGRAPXCAL CASTNG MACHINE.

Specification of Letters Patent.

VPatented May 9, 1922.

Application filed August 25, 1921. Serial No. 495,272.k

To all wht-0m t may concern? K, y Be it known that I, DAVID S. KENNEDY, a

`citizen of the United States, residing at a specification, reference being had `therein to the accompanying drawing.

AMy invention relates to typographical casting machines, such as linotype machines of the general organization represented in U. S. Letters Patent to O. Mergenthaler No. 486,532, wheiein a melting pot is arranged to deliver molten metal into a slotted mold and up against a composed line oit matrices to produce a type bar or slug bearing on its edge type characters corresponding to the intaglio characters of the matrices. ln these machines, the molten metal lis ordinarily introduced into the mold by means ci asingle pump plunger-disposed within the pot, but in some instances, as when large slugs are to be-cast, two or more suchpump plun' gers are employed, these plungers being op erated simultaneously in filling the mold. In the useof al plurality of pump plungers, it is important that all of them be connected to thel operating means during the casting operation, `not only because the combined action of the plungers is required to charge the mold, but also because the operation of y one plunger independently of another might leadfto serious consequences. Thus, if one plunger were operated while another 1s disconnected from the operating means, the

pressure exerted on the molten metal by the connected plunger would necessarily react on the disconnected plunger and torce the latter, together' with a charge of molten met'ahfrom the casting pot. Or, if at the time, the disconnected `plunger had been taken from'the pot for cleaning ory otherwise, a more violent splash of moltenmetal wouldnaturally result. l

V.The present invention, to guard against such occurrences as the above, is directed to` a safety device which will prevent the operation of one pump without the other. The exact form and arrangement of the parts will be best understood from the detailed description to follow:

` `Referring to the drawings:

Figi 1'- is a vertical section taken through `theeasting mechanismv of a linoa type machine having my invention embodied therein; I

Fig x2 is a section taken on the line 2 2 of Fig. l, looking downwardly; y

Fig. 3 is a detail view;

4 is a section taken on the line 4 4 ci Fig. l, looking forwardly or toward'the right yin the latter ligure.

'ln Fig. l, the parts are shown in the relative positions they occupy just prior to the casting operation. In thisy condition of the parts, the slotted mold A, carried bythe rotary disc A?, is closed at the front by the composed line of matrices X presented momentarily thereto by the lirst elevator B, and it is closed at the rear by the mouth piece C1 ofthe melting pot C sustainedl within the rocking frame or jacket D.

V'Vithin the pot C are located the two distinct pump pistons oi' plungers E fitted mto the separate wells or cylinders El, both communicatingwith the throat or passage sleeve F1 mounted loosely on the fixed transnk versc rod Gr of the machine frame. The sleeve `Flhas two arms F2 and F 3, the former carrying the roller F4' which is arranged to track upon the periphery of the ordinary rotarycam F5, and the latter being extended laterally beneath the further lever F which is lalso mounted loosely on the fixed rod G and which has'it free end connected to the tension spring `F7 pulling Ydownwardly thereon from a ixed part of the machine. The lever F is also urged downwardly by the customary spring-actuated rod F8 acting directly thereon. As well understood, the peripheral face ot the cam F5 is concentric throughout except at one portion of its circumference, l where it is cut away or formed with a depression to provide the usual sloping surfaces FD and F1". VWhen"v the :machine `is at rest, the roller F4 `is in` contact. with they concentric portion of the cam F5, so that the two plungers E are maintained in their raised orl inoperative condition, as indicated in Fig. l, This condition cbtains until the casting period arrives, when the cam (rotating in the direction of the arrow) brings its sloping surface F 9 into engagement with the roller F4, which then descends along such surface to the bottom or' the depression, thus germitting the springs F7 and FS, through the connections described, to depress both plungers simultaneously and torce a charge ot molten metal into the mold. its the cam continues to rotate, the roller F4c is engaged sooner or later by the sloping surface F10, and the parts are thereby restored to and maintained in their' original condition to await the next casting operation. 'Ihe toregoing parts and their mode of operation are well known and in themselves constitute no part ot my invention.

As before stated, the present i vention is directed to a safety device whereby neither pump plunger can be operated independently ot the other. To this end, in the em bodiment illustrated, the lever F is provided. with two independent locking detents II held in place thereon by a trouglrshaped plate I-Il. .A t their rear ends, the detente Il. are formed with laterally projecting lugs H2 adapted to cooperate with abutments ,I formed on the two arms ot a biturcated member J1 fixed to the machine trame and straddling the lever F. At their forward ends, the detents II are 'formed with lateral extensions II3 arranged to be engaged by the plunger rods E2, springs Il, which pull forwardly thereon, tending constant y to maintain said detents in such engaging relation. According to this arrangement, when both of the rods E2 are connected to the operating lever F, as in Figs. l and 2. the detents II are held in inactive positionfthat is to say, with their projecting lugs I-IZ to the rear and clear of the fixed abutments J, so that the two pump plungers are free to be operated in the manner previously de scribed. On the other hand, when either one ot the rods F2 is disconnected Yfrom the operating lever F, as in Fig. 3, the corresponding detent I-I is moved forwardly to active position by the attached spring I'I, that to say, with its projecting lug H2 located above and in engaging relation with the associated fixed abutment J, thereby locking the lever F against depression during the rotation ot the-cam F5, and consequently preventing the operation of either pump plunger. In this way, the dangers previously alluded to are entirely avoided. I

In the accompanying drawings, I have shown my invention merely in preferred form and by way of example, and as applied to al linotype machine ot the general class stated, but obviously there are various other embodiments and adaptations which will suggest themselves: to those skilled in the art andv still be comprised within its spirit. Generally speaking, I desire to be under-v stood but l do not limit myself to any specific form or embodiment except in so Yliar as such limitations are specified in the claims.

Having thus described my invention, what claim is:

l. In a typographical casting machine,lhc combination of a melting pot, a plurality ot pump plungers located therein, operating means Yfor said plungers, and means for preventing the operation oii one plunger independently of another.

In a typographical casting machine, the combination oi a melting pot, a plurality ot pump plungers located therein, operating means detachably connected to the respective plungers, and means for preventing the operation of said plungers when one is disconnected vlrom the operating` means.

3. In a typographical casting machine, the combination olf a melting pot, a plurality of pump plungers located therein, operating means detachably connected to the respective plungers, and locking means to prevent the operation of the plungers, said locking means being inactive when all of the plungers are connected to the operating means and rendered active by the disconnection of any one or the plungers it'rom the operating means.

t. In a. typographical casting machine, the combination of a melting pot, a plurality of pump plungers located therein, operating means therefor including a common lever detachably connected to the respective plungers, and locking means to prevent the action of said lever when one oi the plungers is disconnected therefrom.

In a. typographical casting machine, the combination of a melting pot, a plurality of pump plungers located therein, operating means therefor including a common lever detachably connected to the respective plun-I gers, and locking means to prevent the action oit said lever, the said locking means being inactive when all. of the plungers are connected to the operating lever and rendered active by the disconnection of any one of the plungers :trom the operating lever.

6. In a typographical casting machine, the combination of a melting pot, a plurality of' pump plungers located therein and provided with connecting rods or links, operating means therefor including a common lever detachably connected to the rods or links of the respective plungers, and independent spring-actuated locking detente carried by said lever and controlled in their action by the plunger rods.

7. In a. typographical casting machine, the combination of a melting pot, a plurality of pump plungers located therein and provided with connecting rods or links, operating means therefor including a common lever detachably connected. to the rods or links of the respective plungers, independent spring-- actuated locking detents carried by the operating lever and arranged in position to be engaged by the plunger rods, and stationary abutments With which the locking detente are adapted to engage when in active position.

8. In a typographical casting machine, the combination of the pot C, the pump-plungers 10 E provided with the rods or links E2, op-

erating means including the lever F detachably connected to the rods E2, as by the removable pins E3, the spring-aotuated locking detents H carried by the lever F, and the member J having the abutments J1 to cooperate with the locking detents.

In testimony whereof, I have affixed my signature hereto.

DAVID S. KENNEDY. 

